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Date:	Wed, 24 Mar 2010 10:47:41 +0900
From:	Minchan Kim <>
To:	KAMEZAWA Hiroyuki <>
Cc:	Mel Gorman <>,
	Andrew Morton <>,
	Andrea Arcangeli <>,
	Christoph Lameter <>,
	Adam Litke <>, Avi Kivity <>,
	David Rientjes <>,
	KOSAKI Motohiro <>,
	Rik van Riel <>,,
Subject: Re: [PATCH 07/11] Memory compaction core

On Wed, Mar 24, 2010 at 10:03 AM, KAMEZAWA Hiroyuki
<> wrote:
> On Tue, 23 Mar 2010 12:25:42 +0000
> Mel Gorman <> wrote:
>> This patch is the core of a mechanism which compacts memory in a zone by
>> relocating movable pages towards the end of the zone.
>> A single compaction run involves a migration scanner and a free scanner.
>> Both scanners operate on pageblock-sized areas in the zone. The migration
>> scanner starts at the bottom of the zone and searches for all movable pages
>> within each area, isolating them onto a private list called migratelist.
>> The free scanner starts at the top of the zone and searches for suitable
>> areas and consumes the free pages within making them available for the
>> migration scanner. The pages isolated for migration are then migrated to
>> the newly isolated free pages.
>> Signed-off-by: Mel Gorman <>
>> Acked-by: Rik van Riel <>
>> Reviewed-by: Minchan Kim <>
> I think lru_add_drain() or lru_add_drain_all() should be called somewhere
> when we do __isolate_lru_page(). But it's (_all is) slow....

migrate_prep does it.

Kind regards,
Minchan Kim
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